Accessory device for gasoline engines



April 30, 1957 P. AUGUST ACCESSORY DEVICE FOR GASOLINE ENGINES s Sheet s-Sheet 1 Filed Nov. 15, 1954 INVEN TOR. PABLO AUGUST ATTORNEYS April 30, 1957 P, A G ST 2,790,709

ACCESSORY DEVICE FOR GASOLINE ENGINES Filed Nov. 15, 1954 5 Sheets-Sheet 2 15 IN VEN TOR.

1? PABLO AUGUST BY r /A w ATTORNEYS April 30, 1957 AUGUST 2,790,709

ACCESSORYDEVICE FOR GASOLINE ENGINES Filed Nov. 15, 1954 3 Sheets-Sheet 5 III III IIIIIIIIIII I,

INVENTOR. PABLO AUGUST ATTORNEYS.

United States Patent ACCESSORY DEVICE FOR GASOLINE ENGINES I Pablo August, Berna], Argentina- Application November 15, 1954, Serial No. 468,950

8 Claims. (Cl. 48-107) Mypresent invention refers to certain new and useful improvements in gasoline engines and. more particularly to a novel accessory device for gasoline engines for the improvement of the fuel-air mixture as usually supplied by the carburetor to the working cylinders of the known gasoline engines, in such a manner that the presence of condensed fuel particles in said mixture is practically avoided, that by virtue hereof a complete combustion is ensured, that the fuel consumption is advantageously reduced, and that improved working conditions of the engine ensure a longer lifetime of the latter.

The fuel generally used for the operation of gasoline engines employing a carburetor is gasoline of a boiling range of from about 70 to 200 C. It is well known that the carburetor produces a gasification of the fuel only to a certain relatively low degree and that its main object is to correctly proportion and to perfectly mix the fuel and the combustion air. I

In as far as mixing of fuel and air is concerned the carburetor is absolutely unable to avoid the formation of a fuel condensate on the carburetor walls which in the best of the cases have a temperature of but 50 C. i. e. a temperature far below that required by the lowest boiling gasoline components for their gasification.

The condensed fuel particles travel along the inner walls of the carburetor and of the fuel-intake pipe and continue moving at leastin part on the inner walls of the working cylinders. In view of that these condensed fuel particles are not surrounded by the quantity of oxygen required for their combustion, they are not burnt or only partly burnt with the result that they form deposits of carbonized oil on the top surfaces of the pistons, in the cylinder heads and on the valve bodies or being entirely unburnt enter the crankcase or leave through the exhaust pipe.

If the carburetor would be adjusted so as to supply the working cylinders with fuel and combustion air in the theoretically correct proportion of 1:15, in the fuel-air mixture effective in the working cylinders the fuel proportion would be too small in view of that due to the afore-mentioned condensation of part of the fuel this part is practically lost, because it is not mixed with air and does not participate in the combustion. For the reason the carburetor has to be adjusted for a fuelzair proportion of about 1:13 to 1:14.

Another disadvantage of the fuel-air mixture supply to the working cylinders as hitherto performed consists in that said mixture on its way from the carburetor to the working cylinders is partly decomposed by the effect of centrifugal forces likely to be developed in the bent portions of the fuel intake, that thereby additional fuel particles are condensed and that the fuel-air mixture entering the working cylinders is such that an uncomplete combustion cannot be avoided with the result that the output of the engine is diminished.

The present invention aims at eliminating the drawbacksas hereinbefore referred to and to thereby conice siderably improving the operation of the gasoline en-. gmes.

The main object of the invention is to provide an accessory device for gasoline engines for the improvement of the fuel-air mixture as usually supplied by the known carburetors, characterized by the combination of collecting means arranged at a point situated between the carburetor and the fuel-intake opening of the working cylinder for gathering condensed fuel particles, with con densate-elaborating means connected with said condensate-collecting means for thermally treating and gasifying said fuel condensate, and with mixing means arranged at said fuel-intake opening for re-introducing the gasified fuel condensate into the flow of the fuel-air mixture as directly drawn in from the carburetor.

In view of that fuel condensation is produced not only on the inner walls of the carburetor, but also on the inner walls of the fuel-intake pipe which connects the carburetor with the fuel-intake opening of the working cylinder, in accordance with one feature of the invention, the condensate-collecting means are preferably arranged at the outlet end of said fuel-intake pipe i. e. between the latter and said fuel-intake opening. Further, in View of that the mixing means for re-introducing the gasified fuel condensate into the flow of the fuel-air mixture drawn in through said fuel-intake pipe is arranged at said fuel-intake opening, according to another important feature of the invention, said condensate-collecting means together with said mixing means and with the condensateelaborating means are preferably combined into a single unit capable of being mounted as such between the said fuel-intake pipe and fuel-intake opening of the working cylinder. j

According to an additional feature of the invention, the condensate-collecting means, consists of a tubular, preferably cone-shaped member so arranged that it somewhat projects into the outlet end portion of the carburetor or of the fuel-intake pipe and that it forms a central passage for the fuel-air mixture supplied by the carburetor and an annular groove for collecting the condensed fuel particles travelling along the inner walls of the carburetor and/ or the fuel-intake pipe, said annular groove being provided with an outlet port for draining off the collected fuel condensate.

The outlet port of the said annular condensate-collecting groove, according to another feature of the invention, is conveniently provided with a branch pipe for connecting said outlet port with a source of water vapour, for instance, the radiator of a gasoline engine, for the admixture of a small quantity of water vapour with the collected fuel condensate, said branch pipe being controlled by a spring-loaded valve operatively connected with the throttle valve of the carburetor in such a manner that the supply of water vapour is effective only when the gasoline engine operates at higher speed. In view of that the water vapour is caused to pass together with the fuel condensate through the condensate-elaborating means and is subjected therein to an intensive heat treatment, it is practically dried and keeps clean not only said condensate-elaborating means, but also the gasoline engine, by virtue of that it forms with the carbonized oil likely to be deposited on the inner walls of said condensate-elaborating means water gas, with the advantageous result that in this manner even the octane number of the gasified fuel condensate and therewithof the final fuel-air mixture delivered to the working cylinder is' of heating the fuel condensate to about 250 C. and

more. In this manner the fuel condensate is entirely gasified with the advantageous result that the fuel-air mixture delivered to the working cylinder does not contain condensed fuel particles which due to an uncomplete combustion tend to form carbonized oil. By virtue here- ,Of the engine is maintained clean and the compression ratio may be increased-without'the risk of self ignition likely to be produced by the presence of incandescent carbonized oil, thereby increasing the output of the engine and rendering its operation more economical.

Further, in view of that particularly the high-boiling components of the benzine are subject to condensation and of that these components have a lower anti-knock yalue,.the thermal elaboration of the fuel condensate into a combustible gas of higher octane number and higher antiknock quality, the device according to this invention is indeed capable of ensuring a lower fuel comsumption at a simultaneously increased output of the gasoline engine.

The mixing means of the accessory device for gasoline engines according to the invention consist of an annular member forming a cone-shaped passage for the fuel-air mixture supplied by the carburetor of the gasoline engine and being provided in its inner surface with guide grooves so arranged that they impart to said fuelair mixture 2. rotatory motion, and of an annular channel formed around said annular member and connected, at the one hand, with the condensate-elaborating means of the accessory device and, at the other hand, by way of a number of small oblique channels with the outlet end of the said passage, said number of small channels being so arranged that the gasified fuel condensate passing therethrough receives a rotary motion opposite that of said fuel-air mixture, with the advantageous result that the opposite rotatory motions perform an intensive mixing of the gasified condensate with said fuel-air mixture and at the same time counteract each other to such a degree that the final fuel-air mixture is delivered to the working cylinder without any turbulence capable of producing a new decomposition of said mixture.

According to an additional feature of the invention, the said tubular member is formed at its outlet opening with a sharp edge with the advantageous result that any condensed fuel particles eventually formed within said tubular member at said edge will lose their support and be re-introduced into the fuel-air mixture by the gasified hot fuel condensate under simultaneous vaporization of said particles so that the said final fuel-air mixture does not contain any condensed-fuel particles. In this manner the working cylinder receives a very homogeneous fuel-air mixture ensuring a complete and uniform combustion, a lower fuel consumption, a higher output and a longer lifetime of the gasoline engines.

With these objects and advantageous features in view my present invention comprises the arrangement, combination and construction of parts as will be hereinafter fully described with particular reference to the accompanying drawings, whereon by way of example only several embodiments of the invention have been illustrated and whereon:

. Figure l is a schematic sectional view of the accessory device for gasoline engines according to my invention;

Figure 2 is a detail cross sectional view of the mixing means of said device, taken along the line 22 of Figure 1;

Figures 3, 4 and show the accessory device according to my invention in a modified embodiment adapted to be interposed as a unit between the fuel-intake pipe and the fuel-intake opening of the working cylinder of a gasoline engine;

Figure 3 being a longitudinal sectional view and Figures 4 and 5 cross sectional views along the lines 4--4 and 55, respectively, of Figure 3;

Figures 6 and 7 show in a horizontal sectional view and in a vertical sectional view, respectively, a modified 4 embodiment of the invention similar to that illustrated in Figures 3 and 5, and

Figure 8 is a schematic vertical cross sectional view of a further modified and considerably simplified embodiment of the invention.

In these figures like reference numerals refer to like or corresponding parts. v

The accessory device for improving the fuel-air mixture as usually supplied by the carburetor to the working cylinder or cylinders of a gasoline engine, according to the present invention, comprises three essential parts, viz. collecting means for gathering the fuel condensate formed on the inner walls of the carburetor and/or fuel-intake pipe, condensate-elaborating means for thermally treating and gasifying the collected fuel condensate, and mixing means for introducing the gasified fuel condensate into the fuel-air mixture as normally drawn in from the carburetor.

In the embodiment of my invention as illustrated in Figures 1 and 2, the collecting means for gathering condensed fuel particles comprise an annular member 1 and a tubular flange 2 so arranged in said annular member that it forms therewith an annular collecting groove 3 which directly communicates with an outlet port 4 for draining off the fuel condensate gathered in said groove.

The so formed condensate collector is arranged at the outlet end of the carburetor 5 of a gasoline engine so that the condensed fuel particles formed on and travelling along the inner walls of the carburetor are gathered in the collecting groove 3, whereas the fuel-air mixture flows through the tubular flange member 2 into the fuel-intake pipe 6. The flange member 2 has an outer slightly conical surface and is so constructed and arranged that it somewhat projects into the outlet end portion of the carburetor.

Instead of arranging the condensate collector at the outlet end of the carburetor 5 as shown, it will be more convenient to attach the same to the end of the intake pipe 6 so that any fuel condensate likely to be formed by the effect of centrifugal forces on the inner walls of said pipe will be also gathered and thus prevented from entering the working cylinder or cylinders of the gasoline engine.

The outlet port 4 is connected by means of a pipe 7 with condensate-elaborating means which in the embodiment as shown in Figure l comprise a casing provided with inlet and outlet ports 9 for interposing said casing in the exhaust pipe (not shown) of the gasoline engine and with a number of heat-exchanging tubes 10 extending through said casing and directly communicating with inlet and outlet chambers 11, 12 of which the inlet chamber 11 is connected with the pipe 7, whereas the outlet chamber 12 is connected by way of a pipe 13 with the mixing means of the accessory device according to the invention.

The exhaust gases of the gasoline engine passing through the casing 8 in heat-exchanging contact with the tubes 10 raise the temperature within these tubes to at least 250 C. and completely gasify the fuel condensate supplied thereto by the pipe 7 and inlet chamber 11. If a higher temperature is attained and particularly if the heat-exchanging tubes are internally nickel-plated or coated with another catalytic material, a cracking process may be performed therein with the advantageous result that the fuel condensate is elaborated into combustible gases of higher octane number and that the anti-knock quality of the final fuel-air mixture is improved.

The thermally elaborated and gasified fuel condensate is to be introduced into the flow of the fuel-air mixture as normally drawn in from the carburetor 5. For this purpose the accessory device according to the invention comprises mixing means consisting of an annular body 14 forming truncated conical passage 15 and being so constructed and arrangedfthat its larger opening is in axial alignment with the intake pipe 6, whereas its smaller opening directly communicates with the fuelintake'opening 16 of a working cylinder (not shown) and forms a sharp edge 17 at which any condensed fuel particles moving along the inner surface of said passage lose their support and are re-introduced into the flow of the fuel-air mixture drawn in from the carburetor. The inner wall of the passage 15 is provided with oblique or preferably helical guide grooves 18 capable of imparting a rotatory motion to said fuel-air mixture.

The wall 19 of the passage 15 forms with the outer wall of the annular body 14 an annular channel 20 which, at the one hand, is connected by way of the inlet port 21 with the afore-mentioned pipe 13 and, at the other hand, is connected by means of a number of small oblique channels 22 with the smaller opening of the passage 15'at points immediately adjacent the edge 17, the arrangement of said channels 22 being such that the fuel gases coming from the condensate-elaborating tubes 10 receive a rotatory motion opposite the rotatory motion of the said fuel-air mixture. Hereby the said fuel gases are not only thoroughly and homogeneously mixed with the fuel-air mixture, but also counteract and practically annul the rotatory motion of the latter so that the final fuel-air mixture delivered to the working cylinder enters the latter without any turbulence which might be able to produce a new decomposition of said final mixture. Any condensed fuel particles, likely to be produced by the effect of centrifugal forces developed by the rotatory motion of the fuel-air mixture in the passage 15 by the counter-flow of the hot fuel gases from the condensateelaboratin-g tubes 10 are again vaporized and reintroduced into the fuel-air mixture. Thus the working cylinder or cylinders of the gasoline engine receive a very homogeneous and correctly proportioned fuel-air mixture without any condensed fuel particles and capable of ensuring a complete and uniform combustion.

The outlet port 4of the condensed-fuel collector 1-3 is conveniently provided with a branch pipe 23 connecting the same with a source of water vapour e. g. the radiator of the gasoline engine and being provided with a spring-loaded valve 24 which is conveniently operatively connected with the throttle valve 25 of the carburetor 5 in such an arrangement that the branch pipe 23 is opened for the supply of water vapour only when the engine operates at higher speeds. The water vapour is drawn in together with the fuel condensate from the collector 3 into the heat-exchanging tubes 10 wherein it combines with any carbonized oilformed by the thermal elaboration of the fuel condensate-into water gas, thereby maintaining said tubes clean and unobstructed.

Referring now to Figures 3 to 5, the embodiment of the invention as shown therein comprises the combination of the condensate-collecting means, of the condensate elaborating means and of the mixing means in a single unit capable of being mounted as such between the intake pipe 6 and the intake opening 16 of the working cylinder of a gasoline engine.

In this embodiment of the invention, the accessory device for gasoline engines comprises a main body 26 and a cover portion 27 secured to said main body in any suitable known manner. The main body 26 forms a passage 15 and comprises fixedly arranged in this passage a slightly conical tubular member 2, 19. The portion 2 of this tubular member constitutes the collecting means for gathering the condensed fuel particles travelling along the inner surface of the fuel-intake pipe 6, whereas the portion 19 of said tubular member has its inner wall provided with oblique or helical guide grooves 18 and forms with an inner wall of the main body 26 an annular channel 20 which by means of a number of small oblique channels 22 is connected with the smaller opening of the passage 15 at points immediately adjacent the sharp edge 17 and by way of a conduit 13 with a condensate-elaborating chamber 10 which acts in the same manner as the tubes 10 of the embodiment of Figure 1.

For this purpose the chamber 10 is connected by way of a channel 7 with the annular collecting groove 3, and the main body 26 comprises a passage 28 capable of being interposed in the exhaust pipe of the gasoline engine. A heat-exchanging body 29 projects in part into the passage 28 of the exhaust gases and in part into the chamber 10 for transmitting part of the heat of the exhaust gases to the fuel condensate in the chamber 10. The heatexchanging body 29 as clearly shown in Figures 3 and 5 is provided with cooling ribs 30, and these ribs as far as they extend into the chamber 10 as well as the channel 7 may be made of or coated with a catalytic material. In view of that in Figures 3 to 5 the operative parts are indicated by the same reference numerals of the corresponding parts shown in Figures 1 and 2, the arrangement of the device according to this embodiment will be clearly understood without further description.

The embodiment of the invention as shown in Figures 6 and 7 diifers from that of Figures 3 to 5 by a simplified arranged of the condensate-elaborating chamber 10 and its connections 7 and 13 with the condensate-collecting groove 3 and the annular channel 20 of the mixing device, respectively. In this case the condensate-elaborating chamber 10 is an annular space provided around a tube 31 inserted into the perforation 28 of the main body 26 for the passage of the exhaust gases and conveniently provided with an outer nickel-plating as catalytic agent.

- A further embodiment of the invention has been shown in Figure 8, wherein a truncated cone member 2, 19 is inserted into the outlet end of the fuel-intake pipe 6 forming the passage 15 for the fuel-air mixture drawn in from the carburetor. This tubular member 2, 19 is fixedly secured in the pipe 6 by means of a ring member 32 and the end portion of this pipe is surrounded by an annular casing 33 forming a chamber 34 interposed in the exhaust pipe (not shown) of the gasoline engine. The arrangement in this further embodiment is such that the fuel condensate travelling along the inner surface of the fuelintake pipe 6 is collected by the tubular cone-shaped member 2, 19 in the chamber 10 wherein it is subjected to a heat treatment by the hot exhaust gases passing through the annular chamber 34, whereafter the gasified condensate, when passing through the oblique channels 22 receive a rotatory motion opposite the rotatory motion imparted to the fuel-air mixture in the passage 15 by the oblique or helical guide grooves 18 on the inner surface of the tubular cone-shaped member 2, 19.

The operation of the accessory device for the improvement of the fuel-air mixture in gasoline engines according to the invention is as follows:

The condensed fuel particles formed on the inner walls of the carburetor 5 are collected in the annular groove 3. This collecting groove by way of the conduit 7, of the condensate-elaborating tubes or chamber 10 and of the annular channel 20 and oblique channels 22 is continuously in direct communication with the interior of the working cylinder or cylinders of a gasoline engine, so that the suction produced by the pistons is not only effective in the fuel-intake pipe 6, but also in all parts of the accessory device. By virtue hereof the fuel condensate collected in the groove 3 with a small proportion of air is drawn into the condensate-elaborating tubes or chamber 10 and therein is heated to at least 250 C. At this temperature the collected fuel condensate is entirely gasified. If a higher temperature is attained, the thermal elaboration of the fuel condensate will cause enrichment of the fuel-air mixture in aromatic and unsaturated components and an improvement of the anti knock quality of the same. i

The so elaborated and gasified fuel condensate by way of the conduit 13 reaches the annular channel 20 and by way of the small oblique channels 22 is led to the edge 17 of the passage 15 and into the fuel-intake opening 16 of the gasoline engine. By virtue of the arrangement ofthe. annular channel 20 and of the oblique, channels 22 the gasified condensate receives a rotatory motion opposite the rotatory motion imparted by the guide grooves 18 tothe fuel-air mixture drawn in through the, pipe 6 from the carburetor 5. The two opposite motions produce a uniform and homogeneous mixture of the gasified fuel condensate with the fuel-air mixture as supplied by the carburetor and at the same time counteract each other to such a degree that the final fuel-air mixture enters the working cylinder or cylinders without turbulence capable of, again decomposing said mixture and without the presence of condensed fuel particles capable of producing an uncomplete combustion.

What I claim as new and desire to secure by Letters Patent is:

1. An accessory device for a gasoline engine having a carburetor and a working cylinder with an intake port thereto, comprising a conduit connecting said carburetor and the intake port of said cylinder, a tubular section within the carburetor end of said conduit and extending outwardly therefrom into said carburetor; an annular groove on the outer wall of said tubular section directed toward said carburetor to collect any fuel condensate formed on and travelling along the inner wall of the conduit connected to said carburetor, condensate vapori'zing means arranged in effective heat-exchange relationship with an exhaust pipe, pipe means connecting said annular groove and said condensate vaporizing means, mixing means disposed within said intake port, said mixing means comprising an annular body interposed between said intake port and the cylinder end of said conduit, said annular body having a sharp annular edge therein directed toward said intake port for introducing into the flow of fuel-air mixture any condensate formed between said tubular member and said sharp edge, and a plurality of channels within said annular body for conducting the vaporized fuel condensate drawn in from said vaporizing means to said sharp edge into said intake port and for mixing the same with said fuel air mixture directly within said intake port.

2. An accessory device for a gasoline engine having a carburetor, a working cylinder with an intake port thereto and an engine exhaust pipe, comprising a conduit con meeting said carburetor and the intake port of said cylinder, a tubular cone-shaped section within the carburetor end of said conduit and extending outwardly therefrom into said carburetor, an annular groove on the outer wall of said tubular section directed toward said carburetor to collect any fuel condensate formed on and travelling along the inner wall of the conduit connected to said carburetor, an external flange on said tubular member for connection to said conduit and formation of said annular groove, said flange being interrupted at one point to provide an outlet of said groove, condensate vaporizing means comprising a plurality of heat exchanger tubes within a chamber interposed in the engine exhaust pipe, means connecting said aperture and said condensate vaporizing means, mixing means disposed within said intake port, said mixing means comprising an annular cone-shaped body interposed between said intake port and the cylinder end of said conduit, said annular body having a sharp annular edge therein directed toward said intake port for introducing into the flow of fuel-air mixture any condensate formed between said tubular member and said sharp edge, a closed chambcr surrounding said annular body, means connecting said closed chamber and said condensate vaporizing means, and a plurality of channels in the wall of said annular body arranged for conducting the vaporized fuel condensate drawn in from said vaporizing means to said sharp edge into said intake port and'for mixing the same with said fuel air mixture within said intake port.

3. An automobile accessory device as claimed in claim 2, with the said annular body having its inner wall provided with inwardly projecting guide means capable of, imparting a rotary motion to the said mixture, and whereinthe said member of small channels provided in the said second flange of said annular body are so arranged as to impart to the fuel condensate a rotatory motion opposite the. rotation of said fuel air mixture so as to homogeneously mix the latter and said vaporized fuel condensate.

4. An accessory device for a gasoline engine having a fuel intake pipe leading to the fuel intake port of a working cylinder, comprising a joining piece interposed between said working cylinder and said fuel intake pipe, said joining piece having a first aperture communicating said fuel intake pipe with said fuel intake port, first and second circumferential flanges in said first aperture, a cone-shaped annular body mounted on said flanges, the larger end of said annular body extending into said fuel intake pipe, an annular channel around said larger end for collecting any condensate formed on and travelling along the inner wall of said intake pipe, a sharp edge formed on the opposite end of said annular body at said fuel intake port for reintroducing into the flow of said fuel air mixture any fuel-air condensate formed on the inner wall of said body, a first conduit in said joining piece communicating with said annular channel for draining ofl? the fuel condensate collected therein, said joining piece having a second aperture for communicating the exhaust port of said working cylinder with the exhaust pipe of said engine, a condensate vaporizing chamber formed in said joining piece in heat exchange relationship with said second aperture, a closed annular channel around said annular body between said flanges, a second conduit connecting said closed channel with said condensate vaporizing chamber, said first conduit communicating with said closed channel and said condensate vaporizing chamber, and a plurality of channels in said second circumferential flange for conducting the vaporized fuel condensate drawn in from said vaporizing chamber by way of said closed channel to said sharp edge into said intake port and for mixing the same with said fuel air mixture directly within said intake port.

5. Accessory device for gasoline engines according to claim 4, wherein a heat-transmitting member is provided between said second aperture of the said joining piece and said vaporizing chamber provided in this joining piece for improving the heat exchange relationship between this vaporizing chamber and said second aperture.

6. Accessory device for gasoline engines according to claim 4, wherein inwardly projecting guide means capable of imparting to the fuel-air mixture a rotary motion are provided on the inner wall of the said slightly cone-shaped annular body and wherein the said plurality of small channels provided in the said second flange of said annular body are so arranged as to impart to the fuel condensate a rotatory motion opposite the rotation of said fuel-air mixture so as to homogeneously mix the latter and said vaporized fuel condensate.

7. Accessory device for gasoline engines according to claim 4, wherein the said vaporizing chamber is formed by the outer surface of a tube member inserted into the said second aperture of the said joining piece annular space formed in the wall of said second aperture.

8. An accessory device for a gasoline engine having a fuel pipe connected with the fuel-intake port of a working cylinder, comprising a cone-shaped tubular body provided at its smaller end with an outwardly projecting flange and arranged with this flange abutting the outer edge of said fuel intake port within the end portion of said fuel intake pipe, said tubular cone-shaped body extending with its larger end portion into said intake pipe and providing between its outer surface and the inner surface of said intake pipe a combined condensate-collecting and vaporizing annular space, a number of small channels provided in said outwardly projecting flange for connecting said annular space with the inner edge of the smaller end of said tubular body at the entrance References Cited in the file of this patent of said fuel-intake port, and an annular casing provided UNITED STATES PATENTS around the end portion of said fuel intake pipe adjacent said fuel intake port and interposed in an exhaust pipe 1629565 Wm'er May of the engine for heating a portion of said annular space 5 gigg and VaPOl'lZlDg the fuel condensate collected therem. 1,815,178 Balachowsky at all y 21, 1931 1,939,318 Rathburn Dec. 12, 1933 2,685,504 Ulbing Aug. 3, 1954 

1. AN ACCESSORY DEVICE FOR A GASOLINE ENGINE HAVING A CARBURETOR AND A WORKING CYLINDER WITH AN INTAKE PORT THERETO, COMPRISING A CONDUIT CONNECTING SAID CARBURETOR AND THE INTAKE PORT OF SAID CYLINDER, A TUBULAR SECTION WITHIN THE CARBURETOR END OF SAID CONDUIT AND EXTENDING OUTWARDLY THEREFROM INTO SAID CARBURETOR, AN ANNULAR GROOVE ON THE OUTER WALL OF SAID TUBULAR SECTION DIRECTED TOWARD SAID CARBURETOR TO COLLECT ANY FUEL CONDENSATE FORMED ON AND TRAVELLING ALONG THE INNER WALL OF THE CONDUIT CONNECTED TO SAID CARBURETOR, CONDENSATE VAPORIZING MEANS ARRANGED IN EFFECTIVE HEAT-EXCHANGE RELATIONSHIP WITH AN EXHAUST PIPE, PIPE MEANS CONNECTING SAID ANNULAR GROOVE AND SAID CONDENSATE VAPORIZING MEANS, MIXING MEANS DISPOSED WITHIN SAID INTAKE PORT, SAID MIXING MEANS COMPRISING AN ANNULAR BODY INTERPOSED BETWEEN SAID INTAKE PORT AND THE CYLINDER END OF SAID CONDUIT, SAID ANNULAR BODY HAVING A SHARP ANNULAR EDGE THEREIN DIRECTED TOWARD SAID INTAKE PORT FOR INTRODUCING INTO THE FLOW OF FUEL-AIR MIXTURE ANY CONDENSATE FORMED BETWEEN SAID TUBULAR MEMBER AND SAID SHARP EDGE, AND A PLURALITY OF CHANNELS WITHIN SAID ANNULAR BODY FOR CONDUCTING THE VAPORIZED FUEL CONDENSATE DRAWN IN FROM SAID VAPORIZING MEANS TO SAID SHARP EDGE INTO SAID INTAKE PORT AND FOR MIXING THE SAME WITH SAID FUEL AIR MIXTURE DIRECTLY WITHIN SAID INTAKE PORT. 